Well I can tell ya the three major companys, Advanced nutrients, Canna, General Hydroponics. It really depends on what you're going for. Canna aqua is really clean and produces great product. Where as advanced is meant for quantity over quality. And finally General Hydro is the good old faithful. They are the ones that created the art that is hydro by engineering it for the first NASA space missions. I grew with gh flora douo and the additives and the product was amazing but the yield just wasn't quite there... I grow with canna aqua now and I will most likely stick with is unless I get a wild hair up my ass or something. There are other brands of nutrients out there but in the grow business its all about word of mouth and I just haven't heard anything about any other nutrients from any one I know...
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